COS AWS: old AMI type

When applying the aws infra terraform module, it fails with
```
│ Error: creating EKS Node Group (cos-cluster:cos-workers): operation error EKS: CreateNodegroup, https response error StatusCode: 400, RequestID: 9e50d975-8937-4c60-a4b1-03352d65c3e3, InvalidParameterException: AMI Type AL2_x86_64 is only supported for kubernetes versions 1.32 or earlier
│
│ with aws_eks_node_group.cos_workers,
│ on main.tf line 246, in resource "aws_eks_node_group" "cos_workers":
│ 246: resource "aws_eks_node_group" "cos_workers" {
│
╵
error: Recipe `apply_infra` failed on line 12 with exit code 1
```

We need to:
1- use a newer image
2- probably we'd want that to be an input with a default value

Start at main.tf line 246, where the aws_eks_node_group.cos_workers resource defines the AMI type, and inspect the Terraform module inputs and defaults. Run apply_infra to reproduce the failure; done means the module uses a newer compatible image and exposes that choice as an input with a default.

Written by the indexing model from the issue text.